How to design a good PCB?

Good PCB design can reduce electromagnetic interference, improve signal integrity, and ensure the stability and performance of the device. The following will introduce some PCB design principles and layout optimization methods to help engineers better solve these problems in practice.

1. The understanding of electromagnetic interference

In PCB design, electromagnetic interference is a common and serious problem. It can lead to signal distortion, unstable equipment operation or even damage. The sources of electromagnetic interference include power lines, high-frequency signals, ground return and so on. Understanding the principle of electromagnetic interference is the first step in solving the problem.

2. Ground design and separation

Good ground design is the key to reducing electromagnetic interference. In the PCB layout, the ground return path should be reasonably planned to avoid the return path is too long or the loop is too large. At the same time, for digital signals and analog signals, should be separated from the design to reduce the interference between them.

3. Signal line length matching

For high-speed signal lines, such as clock signals or differential signals, should try to keep the length of the matching, reduce the signal arrival time difference, thereby improving signal integrity. You can use wiring rules or adjust the PCB level to achieve length matching.

4. Power and ground planning

Power and ground planning is also an important part of PCB design. Should avoid power lines and signal lines, ground cross-wiring, reduce electromagnetic interference. At the same time, for high-power devices, should also consider the width of the power line and the copper area to ensure stable current transmission.

5. Impedance matching and signal adjustment

In high-frequency signal transmission, impedance matching is the key to ensure signal integrity. Impedance matching can be achieved by adjusting the line width, spacing or using an impedance matcher to reduce signal reflection and attenuation.

6. PCB hierarchical design

Reasonable PCB level design can effectively reduce signal traversal and interference. Layers of wiring, signal layer and ground layer adjacent to the method to improve the anti-interference ability of the PCB.

Quick facts about NeoDen

① Established in 2010, 200+ employees, 8000+ Sq.m. factory

② NeoDen products: Smart series PNP machine, NeoDen K1830, NeoDen4, NeoDen3V, NeoDen7, NeoDen6, TM220A, TM240A, TM245P, reflow oven IN6, IN12, Solder paste printer FP2636, PM3040

③ Successful 10000+ customers across the globe

④ 30+ Global Agents covered in Asia, Europe, America, Oceania and Africa

⑤ R&D Center: 3 R&D departments with 25+ professional R&D engineers

⑥ Listed with CE and got 50+ patents

⑦ 30+ quality control and technical support engineers, 15+ senior international sales, timely customer responding within 8 hours, professional solutions providing within 24 hours